Tubular rivet and the like article



Aug. 5 1924.

Y E. B. STIMPSON TUBULAR EIvET AND THE LIKE ARTICLE Filed Nov. 1, 1920 IMNVENTOR BY Ai z W Ada/9 &

Pdtentd Aug. 5, 1924.

UNITED STATES 1,503,859 PATENT orrlca EDWIN B. STIKPSO'N, 01' BROOKLYN,NEW YORK, ASSIGNOB TO EDWIN B. STIIPSON COIPL'NY, OI BROOKLYN, NEW YORK.

TUBULAR BIVE'I' AND THE LIKE ARTICLE.

To all whom it may concern:

Be it known that I, EDWIN B. STIMPSON, a citizen of the United States,residing at Brooklyn, in the county of Kings and State of New York, haveinvented certain new and useful Improvements in Tubular Rivgt and thelike Articles, of which the following is a specification.

This invention relates to improvements in tubular rivets or the likearticles, and has for its object to provide, inarticles of this clas, aconformation which will strengthen the tubular art to greaterresistivity as against buck mg or crumpling of the tube resulting fromthe operations of setting or upsetting the rivet.

For accomplishing this object I provide that the wall of the penetratingend of the rivet tube shall be of desirably minimum thickness and thatthe wall shall progressively and regularly increase in thickness fromthe penetrating end of the tube towards the opposite or head endthereof. Incidentall I prefer that the outside diameter of t e tubeshall be uniform from end to end; in other words, I aim to provide arivet in which the tubular part is of uniform outside diameter and ofprogressively decreasing inside diameter from the penetragting endtowards the head end of the tu c.

It will be evident that by such a construction I retain the desirablepenetrating qualities for the one end of the rivet, and give itnecessary additional strength between its two ends where buckling orcrumpling might otherwise take place; and because the change inthickness of wall from one end to the other is gradual and progressive,I have a rivet which oifers'the minimum frictional resistance as it isdriven through the member in which it is secured, consistent with theelimination of buckling as aforesaid.

Other objects and aims of the invention, more or less broad than thosestated above, together with the advantages inherent, will be in partobvious and in part specifically referred to in the course of thefollowing description of the elements, combinations, arrangements ofparts, and applications of principles constituting the invention; andthe scope of rotection contemplated will appear from t e claims.

In the accompanying drawings; which are to be taken as part of thisspecification, and

in which I have shown merely a preferred form of embodiment ofinvention,

Figure 1 is an elevation of a headed tubular rivet; Fig. 2 is alongitudinal sectional view on line 2-2 of the same; Fig. 3 is atopeview looking into the open end of the tu In the drawings, thetubular part of the rivet is indicated at 7, the outside at 8, theinside wall at 9 and the head at 10.

The wall of the tube, from the penetrating end thereof towards the headend may be said to consist of a series of annuli 12, 13,

14, 15, &c.,of progressively increasing thickness from the penetratingend to the head end of the tube and merging into and integral' one withthe other, having outside walls of the same diameter, constitutingtogether the outer wall of the tube. That is to say,

the annuli have an outside wall in common,-

which is the outside wall of the tube and their inner walls respectivelyare of progressively decreasing diameter from the penetrating end to thehead end of the tube.

Furthermore, the parts of the tube between adjacent annuli 12, 13, &c.,may be identified as annuli 16, 17, &c., having outer walls in commonwith the outer walls of the annuli 12, 13, &c., and each having an innerwallwhich extends from the end of the inside wall of annulus 12, forinstance, to the end of the inside wall of the next adjacent annulus 13.Consequently the inside wall of each connecting annulus 16, 17 &c. willtaper towards the axis of the tube and from the penetrating end of thetube towards the head end thereof. It results from this conformationthat the inner wall of the tube cross-sectionally considered presents aseries of steps in the following order, a vertical step, an inclinedstep, another vertical step, another inclined step, &c., each verticalstep and each inclined step, from the penetrating end of the tubetowards the head end, being nearer to-the axis of the tube than the onepreceding it. Because of the inclination of the connecting portions 16,17, &c., the tube offers the minimum resistance to its own passagethrough the sheet or material to which it is secured in practice,consistent with the necessary strength to prevent buckling or erumplingbetween penetrating end and head end. The conformation shown in Figure 2may be obtained in any preferred way, foninstance, by drilling orreaming outwith drills or reamers of diflerent sizes, employed in propersequence and adapted to make the proper vertical or inclined surfaces.

Inasmuch as many changes could be made in the above construction, andmany apparently widely difierent embodiments of my invention could bemade without departing from the scope thereof, it is 1ntendedthat allmatter contained in the above description or shown in the accompanyingdrawings shall be interpreted as illustrative and not in a limitingsense.

It is also to be understood that the language used in the followingclaims is intended to cover all the generic and ecific features of theinvention herein escribed and all statements of the scope of theinvention which, as a matter of language, might be said to falltherebetween.

claim 1. An article of the kind described, having a tubular part made upof an integral series of annuli with co-axial inner walls and with outerwalls which are in longitudinal extension and continuation of oneanother, and the annuli being of thickness progressively increasing fromone end of the tube to the other.

2. An article of the kind described, having a tubular part made up of anintegral series of annuli with co-axial inner walls and with outer wallswhich are in longitudinal extension and continuation of one another, andthe annuli bein of thickness progressively increasing from one end ofthe tube to the other, and another series of annuli, each of whichconnects adjacent ones of the first-named series of annuli, the innerwall of each of the second-named series of annuli being inclined towardsthe axis of the tube and from one end thereof toward the other.

3. An article as set: forth in claim 2, in which the outer walls of allof the annuli are in a cylindrical surface coaxial with the tube.

In testimony whereof I aflix my signature.

' EDWIN B. STIMPSON.

